src/glut/fbdev/stroke.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  * Copyright (C) 1995-2006  Brian Paul
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public
  17  * License along with this library; if not, write to the Free
  18  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 /*
  22  * Library for glut using mesa fbdev driver
  23  *
  24  * Written by Sean D'Epagnier (c) 2006
  25  *
  26  * To improve on this library, maybe support subwindows or overlays,
  27  * I (sean at depagnier dot com) will do my best to help.
  28  */
  29
  30 #include <GL/glut.h>
  31 #include "glutstroke.h"
  32
  33 void glutStrokeCharacter(GLUTstrokeFont font, int c)
  34 {
  35    const StrokeCharRec *ch;
  36    const StrokeRec *stroke;
  37    const CoordRec *coord;
  38    StrokeFontPtr fontinfo = (StrokeFontPtr) font;
  39    int i, j;
  40
  41    if (c < 0 || c >= fontinfo->num_chars)
  42       return;
  43    ch = &(fontinfo->ch[c]);
  44    if (ch) {
  45       for (i = ch->num_strokes, stroke = ch->stroke;
  46            i > 0; i--, stroke++) {
  47          glBegin(GL_LINE_STRIP);
  48          for (j = stroke->num_coords, coord = stroke->coord;
  49               j > 0; j--, coord++) {
  50             glVertex2f(coord->x, coord->y);
  51          }
  52          glEnd();
  53       }
  54       glTranslatef(ch->right, 0.0, 0.0);
  55    }
  56 }
  57
  58 int glutStrokeWidth(GLUTstrokeFont font, int c)
  59 {
  60    StrokeFontPtr fontinfo;
  61    const StrokeCharRec *ch;
  62
  63    fontinfo = (StrokeFontPtr) font;
  64
  65    if (c < 0 || c >= fontinfo->num_chars)
  66       return 0;
  67    ch = &(fontinfo->ch[c]);
  68    if (ch)
  69       return ch->right;
  70
  71    return 0;
  72 }
  73
  74 int glutStrokeLength(GLUTstrokeFont font, const unsigned char *string)
  75 {
  76    int length = 0;
  77
  78    for (; *string; string++)
  79       length += glutStrokeWidth(font, *string);
  80    return length;
  81 }